Santa Ana was among the last of the Chiquitos reductions to be founded, established in 1755 by the Jesuit Julian Knogler, decades after the earliest missions had taken root. Its founding came barely a dozen years before the expulsion that would scatter the Jesuits from the continent forever. That timing shaped everything. Where older missions had generations to build under Jesuit direction, Santa Ana was still young when the priests departed, leaving its community to complete what had only just begun. The town grew up small and remote in the Chiquitania, the rolling country between the city of Santa Cruz and the Brazilian border, and small it has largely remained.

What makes Santa Ana extraordinary is who finished it. With the Jesuits gone after 1767, the Chiquitano inhabitants carried on, constructing and maintaining the church on their own according to the designs they had been taught. This was not unique to Santa Ana; across the missions, towns preserved and sometimes extended their churches after the expulsion. But here the indigenous hand is most clearly the whole story, and the church is celebrated as one of the most faithful surviving expressions of the original Jesuit-Chiquitano architectural vision. It is, fittingly, the only mission whose church remains preserved entirely in its original state, never rebuilt, never replaced.

Among the colonial-era missions inscribed by UNESCO as a World Heritage Site in 1990, Santa Ana is regularly called the most authentic. While its sisters underwent extensive restoration in the twentieth century, much of it led by the architect Hans Roth, Santa Ana's church survived in a state so close to the original that visitors and scholars treasure it precisely for what it has not lost. Its interior is considered particularly beautiful, intimate in scale where grander missions overwhelm. To step inside is to encounter the Chiquitos baroque not as a restored showpiece but as something that has simply, stubbornly endured, weathered timber and adobe holding their shape across more than two and a half centuries. That endurance is the whole point of Santa Ana, the reason a small church at the end of a dirt road carries weight far beyond its size.

Santa Ana sits at an elevation of 464 meters, reached today by a dirt road that runs south from San Ignacio de Velasco and passes through after some forty-five kilometers. From the departmental capital of Santa Cruz it is a journey of well over four hundred kilometers, much of it on roads that demand patience, which keeps the crowds away. The town has grown slowly but steadily, from 284 residents recorded in the 1992 census to 483 by 2001 and several hundred more in the years since, a small place expanding at its own unhurried rate. Everyday speech is now Camba Spanish, though the mission once echoed with languages related to Otuke, tongues like Covareca and Curuminaca that have since faded from daily use. There is a stillness to Santa Ana that suits its history. In the least-altered of the Chiquitos churches, in a town few travelers reach, the past feels remarkably present.